Fix bug in drawing DT simhits + improvements

The detid returned by the simhit is the wire ID, but the position is in the ref fame of the DTLayer. This was not taken into account so the simhits were drawn in random places. An example before the fix (green=simhits, blue=reconstructed segments): 
![vis_before_2](https://f.cloud.github.com/assets/5168720/1377337/7036ce48-3aa5-11e3-98ff-6b1a81c11914.png)


After the fix the simhits are correctly aligned:
![vis_after_2](https://f.cloud.github.com/assets/5168720/1377338/77e7708e-3aa5-11e3-85b9-076c45604548.png)


Also: 
-Fix DT simhits in RhoZ view, so that they are displayed aligned to 1D rechits. 
-Draw rechits associated to segments also in the 3D view.